Abstract

PEREZ, Diana  and  IANNACONE, José. Insecticidal effect of Paullinia clavigera var. bullata Simpson (Sapindaceae) and Tradescantia zebrina Hort ex Bosse (Commelinaceae) in the control of Anopheles benarrochi Gabaldon, Cova García & López 1941, main vector of malaria in Ucayali, Peru. Ecol. apl. [online]. 2004, vol.3, n.1-2, pp.64-72. ISSN 1726-2216.

The resistance of mosquito vectors of metaxenic diseases to chemical pesticides has increased in the last years. Facing this reality, a search of alternative methods has begun employing plant extracts with larvicide activity. The aim of the current research was to evaluate the mortality on third stage larvae of Anopheles benarrochi Gabaldon, Cova García & Lopez, 1941 using cooked extract of Paullinia clavigera var. bullata Simpson (Sapindaceae) and tea extract of Tradescantia zebrina Hort ex Bosse (Commelinaceae). The highest mortality percentages were 100 % on 24 h at 10 % and 20 % concentrations with P. clavigera and at 10 % with T. zebrina. Paullinia clavigera showed more insecticide efficient over A. benarrochi in comparison to T. zebrina in terms of LC50 at 1 to 12 h exposure; however, at 24 h, the values of LC50 were similar (P. clavigera, LC50 = 0.81 % and T. zebrina LC50 = 0.86 %).

Keywords : Anopheles benarrochi; biocide; larval mortality; Paullinia; Tradescantia; vegetable extracts.

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